$ git clone -n https://src.fedoraproject.org/rpms/spacebar.git /var/lib/mock/f41-build-side-1-2771311-32222/root/chroot_tmpdir/scmroot/spacebar
Cloning into '/var/lib/mock/f41-build-side-1-2771311-32222/root/chroot_tmpdir/scmroot/spacebar'...
$ git fetch origin 144c740945a8c3704481f2c04818d6b2358d5c55:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/spacebar
 * [new ref]         144c740945a8c3704481f2c04818d6b2358d5c55 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 144c740 Fixup changelog